WASHINGTON — Steven Rattner, who led the Obama administration's efforts to restructure General Motors and Chrysler through swift, government-led bankruptcies, plans to depart his post, officials said Monday.

Rattner will be replaced by former steelworkers official Ron Bloom, who has been a key member of the task force and adviser to Treasury Secretary Timothy Geithner. The administration said Monday that Rattner had decided to return to private life and his family in New York City.

A leaner General Motors emerged from bankruptcy last week, and Chrysler shed itself of Chapter 11 protection last month during short stints through the bankruptcy courts once thought impossible. Rattner headed the government's work to reshape the two companies, which were severely threatened by overwhelming debt, poor management decisions and sluggish sales.